package com.wesley.netty.quickstart;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

/**
 * NettyClient
 *
 * @author WangPanYong
 * @since 2021/11/13 12:19
 */
public class NettyClient {

    public static void main(String[] args) {
        //客户端需要一个事件循环组
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            //创建客户端启动对象
            //注意客户端使用的不是ServerBootstrap而是Bootstrap
            Bootstrap bootstrap = new Bootstrap();
            //设置相关参数
            bootstrap.group(group) //设置线程组
                     // NioSocketChannel：异步的客户端TCP Socket连接
                     .channel(NioSocketChannel.class)
                     .handler(new ChannelInitializer<SocketChannel>() {
                         @Override
                         protected void initChannel(SocketChannel ch) throws Exception {
                             //加入处理器
                             ch.pipeline().addLast(new NettyClientHandler());
                         }
                     });

            System.out.println("netty client start。。");
            //启动客户端去连接服务器端
            ChannelFuture cf = bootstrap.connect("127.0.0.1", 9000).sync();
            //对通道关闭进行监听
            cf.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            group.shutdownGracefully();
        }
    }
}
